<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 400px;
            height: 400px;
            border: 1px solid #000;
            /* display: flex;
            justify-content: center;
            align-items: center; */

            /* position: relative; */

            /* display: grid;
            justify-content: center;
            align-items: center; */
            display: table-cell;
            vertical-align: middle;
            text-align: center;
        }
        .wrap{
            display: inline-block;
            width: 100px;
            height: 100px;
            background-color: red;
            /* position: absolute; */
            /* top: 50%;
            left: 50%; */
            /* transform: translate(-50%, -50%); */
            /* margin: -50px 0 0 -50px; */

            /* top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            margin: auto */
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="wrap">

        </div>
    </div>
</body>
</html>